AI builds a daily mission program with real assignments and a final challenge project — so you have a provable new skill in 2 to 4 weeks, not someday.
The first week is exciting, the second is quiet, and by the third there's no visible proof anything happened. Without daily structure and something to point at, the whole thing fades out.
You can binge twenty hours of video and still not be able to do the thing once. Skill comes from producing something badly, then producing it slightly less badly tomorrow.
They teach everything when you need the narrow slice that gets you doing the thing. You don't need a semester — you need a sprint with an end date.
Without a measurable end and something you actually built, there's never a moment where you get to say you learned it. So it stays permanently in progress.